Patent GB-714566-A (GB)
Title: Improvements in apparatus for punching line-strips from sheets of type matter
IPC: B41B23/00
Filed: 1951-01-17
Abstract: 714,566. Guillotine cutting-machines; punching machines. INTERTYPE, Ltd. Jan. 17, 1951 [Jan 19, 1950], No. 31383/52. Divided out of 714,493. Classes 31 (1) and 31 (2) Apparatus for punching out a faulty line-strip from a sensitized sheet of film or paper having lines of type matter produced in columnwise succession thereon in a photographic type-composing machine, as described in Specification 714,493, is characterized in that the punching means operate upon the sheet while it is located by perforations provided marginally within its opposite edges and sever the faulty line-strip by cutting the sheet along the tops and bottoms of the characters in the line with lateral cuts at the ends of the longitudinal cuts. The faulty line is replaced by a corrected line severed by the punching means from the same or another sheet. Cutting. In one form, the faulty line-strip is punched out in two operating strokes, one to shear above and the other to shear below the type characters in the line to be removed. The cut is made by a shearing knife 55 carried by a manually-operable holder 53 which is movable vertically in dovetail guides. The knife is bevelled upwardly and forwardly from its rear edge 56 so as to effect lateral cuts at the ends of each longitudinal, cut. The sheet is supported on a die carriage 63 which comprises front and rear die plates 63a, 63b, Fig. 6, the space between which forms a die slot. The die carriage is provided with aligning bars 84, 85 carrying pins 84a, 85a over which, when the die carriage is drawn to the dotted-line position shown in Fig. 6, the perforations P<1>, Fig. 17. at opposite ends of any line to be removed are engaged. At their front ends, the aligning'bars 84, 85 are connected by an L-shaped cross tie 86 having a finger piece 86a whereby the bars may be shifted by the extent necessary to align with the knife 55 (with slight clearance) first the tops of the characters in a line of type of any point size and then the bottoms of the characters in such line. Fig. 17 shows the cuts 104 and 105 made above and below the opposite ends of a line L<1>. The extent by which the bars 84, 85 are shifted between operating strokes of the punch is determined by the gap between pins 93, 100, Fig. 8, of different lengths carried by the die carriage which are selected by rotating a knurled sleeve 90 relatively to an index on a fixed disc 89. If it should be desired to increase the gap normally existing between a selected pair of pins, a spring-influenced wedge W, Fig. 8, is shifted by means of a cam Y which can be set to one of four positions. To ensure accurate alignment of the knife 55 in the die slot of the carriage 63, the knife is provided with pilot extensions 72, Fig. 1, which enter apertures 73 in the carriage. The sheared strip is pushed upwardly out of the die slot by means of a spring- influenced stripper bar 67, Fig. 6. The sheet is held against the upper surface of the rear die plate 63b during the shearing operation by means of a spring-influenced presser bar 69 carried by the knife holder 53. The stroke of the knife 55 may be varied to regulate the depth of cut by means of a stepped gauge 75 having teeth 76 on its underside engaged by a pinion 78 on a shaft 79 provided at its front end with a dial 81 bearing different point-size markings and at its rear end with a notched disc 82 co-operating with a spring-ball detent. By setting the dial 81, the gauge 75 is shifted endwise to the required position, and the stroke of the knife is limited by a stop screw 83. The faulty line-strips may be sheared by the knife so as to be temporarily retained in the sheet by easily fracturable tabs 106, Fig. 17. Alternatively, the knife 55 may be used to completely sever a line-strip; in this case, the dial 81 is set to a point size somewhat larger than the type in the line to be removed. Punching. 'In a modification, the faulty linestrip is completely severed in a single operating stroke. To this end; there is provided a plurality of exchangeable knives 113, Fig. 11, of different thicknesses that may be used singly or in selected combinations in accordance with the point size of the type in the line to be removed. In this case, the aligning bars (84, 85) are not shifted, the die slot being adjusted, by adjusting the front plate 108 of the die carriage, to the point size of the type in the line to be removed. Further, the stripper bar (67) is dispensed with, the severed line strips being received in a drawer 114 in the base of the punch.